Tensioning-device for roller blinds



Sept. 3, 1 929. P. SCHULTES V TENS IONING DEVICE FOR ROLLER .BLINDS Filed June 2, 1927 fi D/ C 7/////// .Z? Saba/{e s nvveuraR Patented Sept. 3, 1929.

I rac a scnumnsfor LEICHLIJVlGEN, G R AN f l rnnsromne'nnvrcn non ROLLER B Inns Application filed. June 2, 1927, Serial No.

This invention relates to a spring: tension device for self-acting roller blinds, inwhich the hitherto used pawl which has greatdisadvantages,-is omitted. The new device is -5 so formed that the roller spring can be additionally tensioned when the blind is in use in the simplest manner, without it being necessary to remove the blind and roller.

I An embodiment of the invention is shown by way of example in the accompanying drawing. Y

. Figure his aneleyation of the whole blind. Figure 2 isalongitudinal section through the roller! U I ,5 Ffg ure3 is a front view' of one fixed hearing.

Figure ieis a corresponding side View.

Figure 5 is an elevation of the coupling device, and

, Figure hearing.

The blind a is guided at its lower end by a rod 6 working in rails 0. The upper end of the blind is wound on a hollow roller d. This hollow roller has at one end and inside, hearing discs by means of which it can rotate on a long shaft 6. The outer end f of this shaft is squared and passes through a corresponding square hole 9 in a coupling disc it into the interior of one wall bearing. At the other end the hollow roller is carried in known manner by a pin in a wall bearing i having an open slot. A helical spring m, which can be tensioned by rotating the parts relative to one another, is secured between a point is on the shaft e and some fixed point on the outer bearing disc Z. The coupling disc h carries on its rear face two opposite coupling pins n which, when the disc h is slid al ng the squared end f, enter opposite holes in the disc Z, whereby the hollow roller d is secured fast to the shaft e, so that the parts can no longer rotate relatively. On the outer side, the disc it has a hollow cylindrical flange formed on it, which engages over a bearing bush psecured to the window frame. A pressure spring 1" is arranged within, between the parts h and p which spring continually presses the disc outwards. The bush 1; has an outwardly projecting rim t with two op- -posite notches u (Figure 3) through which corresponding project-ions s (Figure on the cylindrical flange of the disc h are passed, and the disc h then turned through 90, when the projections 8 spring into recesses o in the rim t. In this position the coupling disc 1s 6 is an elevation of the other res ns," and 'in' Germany 'May 21-,"192a; i A

securely heldzowing to the spring This is the normal position when ithevblindlis inuse. In

The main spring-is tensioneddinthe ing manner beforethe device is; mounted in; thebearlngs. 1 a h The hollow roller is taken inione hand, and i the shaft 6 rotated with the otherby the aid. of the coupling disc hon the squared end f. As' long as this is rotated the springis being tensioned. When a sufficient tension is reached, the coupling disc is slid along the squared end until the pins n, enter the holes 0, thus coupling the rotatable partstogether and preventing the spring from unwinding.

the squared end 7", being ,ifir'st inserted; in ,the' bush p' and the pin at the other end then being inserted through the open slot of the bearing '5. The coupling disc h is then moved to withdraw the pins n from the holes 0 and the disc secured by passing it over the bush p and rotating it in the above described manner.

If the spring is to be additionally tensioned when the blind is in position, the blind is pulled down, the coupling engaged, the blind wound up by hand and the parts again disengaged. This can be repeated as often as necessary until the desired tension is Obtained.

What I claim is 1. In combination, a shade roller, a shaft loosely mounted in said roller, a roller tensioning spring connected with the shaft and roller, and a coupling member movable axially of the roller and acting in one position to couple the shaft with the roller and in another position to release the roller.

2. In combination, a shade roller, a shaft loosely mounted in said roller, a roller tensioning spring connected with the shaft and roller, and a coupling member movable axially of the roller and acting in one position to couple the shaft with the roller and in another position to release the roller, said coupling member being arranged externally of the roller.

3. In combination, a shade roller, a shaft loosely mounted in said roller, a roller tensioning spring connected with the shaft and roller, and a coupling member movable axially of the roller and acting in one position to couple the shaft with the roller and in another position to release the roller, said coupling member being arranged externally of the roller and being slidably mounted on said shaft.

The device is now mounted'inthe bearings,

member for saidvcoupling member and: means 4. Ingcombinatiom a shadegroller,;a shaft loosely- -mo1inted insaid roller, a roller tensioning spring connected with the shaft androllcr, and a coupling member moyabletag ially of the roller andaoti'iigih oiiepbsihon" to couple the Shaft thitllfiiiljQll lfinliFi l: another position to release the roller, said shaft being-a polygonal-endreceived in said 7 coupling member, and projections on said coupling member engageable'withisaid roller;

'5. In combinationasha' de Broiler; a 1 shaft loosely mounted in said roller, a roller ten'- Liening' springconnected: with the shaft androller, and acoupling member movable: axially of the roller and acting in one positionto coiiplethe shaftwith theiroller and in another position 'to release the roller; a bearing for maintaining' the coupling member in in operative position' with res pct' to ther'dllel on the bearing memberbl f 'cj 6; In: combination; shade qrolle'r; ashaftsionin'g s ring o ne'etejd withitlie shafe a roller end a c'oupli'n'g member movable ax ia'll y 'bt e'h ioller dnii enaetin tq'couplet-he shaft. with t-he roller, a bearing member foi' said coupling member and means for maintaining the coupling member in inoperativeposition with respect to the roller on the bearing iiiemberfthe last mentioned meansxi e udingisp normally tending to displace the coupling member in the direction'ofthe roller;

7 In combination, a shade roller, a shaft loosely mounted in said roller, a roller tensionin'g spri ng c onncted with the shaft and roller}; and a i coupling member *movable ax'-' ially ofth'e' roller and? actinginone position tomouple the shaft with the roller, a bearing member ifor saidcoupling. member and means for-maintaining the coupling member in in operative p ositibn 5 'w itlf respect to the roller .omth'e bearing-member, the last'mentioned means including;ispringpormally tending to displace the coupl ng member 1n the direction flange members 

